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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Massachusetts doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MA CDL doubles triples test covers the following sections of the Massachusetts CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MA CDL practice test now to prepare for the actual test!
1. After an accident, an improper use of flares could cause:
the vehicle to slide back and forth.
the springs to put on the brakes.
air pressure to build from 50 to 100 psi within 2 minutes.
a fire if spilled fuel is on the ground.
2. You are driving a double. Before entering traffic, you should:
assume there is enough room to merge into traffic.
make sure you have a large enough gap before entering or crossing traffic.
turn on your headlights.
always come to a complete stop.
3. What is the minimum tread depth for tires other than front tires?
4/32 inch
4/16 inch
2/32 inch
8/32 inch
4. When going down a steep downgrade, you should primarily brake using:
the parking brake.
the emergency brake.
the service brakes.
the braking effect of the engine.
5. Emergency brakes are:
not required on buses.
required on all vehicles.
not required on doubles.
not required on commercial vehicles with air brakes.
6. To know how much space you should keep in front of you:
wait until the vehicle ahead of you passes a clear landmark, then count off the seconds until you reach the same spot.
estimate how many vehicle lengths there are between you and the vehicle ahead.
estimate how many seconds it would take you to reach the vehicle ahead.
None of the above.
7. If your ABS fails:
your tires might grab unexpectedly and you could lose control.
you will have no brake function, and could lose control.
you will still have normal brake functions.
the first step is to get the vehicle off the road and stop.
8. To prevent rollover, you should:
drive in the left lane.
turn the engine off while turning.
drive on the shoulder of the road when possible.
drive slowly around corners.
9. You have two tie-downs on a 15 foot load. How many more tie-downs do you need to secure cargo and keep it from shifting or falling?
10. You can release dolly brakes:
by opening the air tank petcock.
by opening the service line valve.
by closing the air tank petcock.
by closing the emergency line valve.
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MA CDL Doubles Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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